Eerie footage of the Martian-like reddish glow caused by a massive new wildfire in Canada has been captured by evacuees forced to flee for the second time from an uncontrolled blaze.

The video was filmed from a vehicle on a near deserted road amid an apocalyptic landscape soaked in a dense orange atmosphere.

The clip was posted on Instagram by officialladysaint, who wrote: "The crazy thing is that there's no filter on this."

They were again heading away from Fort McMurray in Alberta, where less than two weeks ago the entire 90,000 population had been forced to flee when the uncontrolled wildfire raged through some neighbourhoods and destroyed around one in six of the buildings.